What Blockchain is efinity?

Could you please clarify what exactly "efinity" refers to in the context of blockchain technology? Is it a specific blockchain protocol, platform, or application? And if so, what are its main features, advantages, and potential use cases compared to other blockchains in the industry? It would be helpful to have a concise yet comprehensive explanation of what makes "efinity" unique and how it leverages blockchain technology to solve specific problems or meet certain needs.